Air stripper application

Most states require the capture and treatment of air stripper off-gas. Typical off-gas treatment technologies that are applicable to MTBE and other oxygenates are adsorption, thermal treatment, and biotreatment. 

In another application, for a private client, the sponge was used to remove arsenic ions from contaminated wastewater at a bulk fueling terminal. The sponge was used as the finishing technology for water that had been pumped through an air stripper and a granulated carbon bed. In this case, 378,000 gal (1.43 x lO m ) of water was treated at an approximate cost of 0.013/gal ( 0.0034/liter)(N. Hart, personal communication). 

This technology is applicable to the treatment of industrial wastewater and contaminated groundwater. The same technology can also be used to effectively destroy airborne contaminants in the off-gases from industrial processes, air strippers, or soil vapor extraction operations. 

Although side-stripper arrangements have been routinely used in the petroleum industry and side-rectifiers in air separation, designers have been reluctant to use the fully thermally coupled arrangements in practical applications until recently12 15 16. 

The development of thermally coupled systems started with attempts to find energy-saving schemes for the separation of ternary mixtures into three products. One of the first industrial applications was the side rectifier configuration for air separation. The side stripper configuration followed naturally. By combining the two we obtain the fully thermally coupled system of Petlyuk, Platonov, and Slavinskii [Int. Chem. Eng., 5, 555 (1965)] see Fig. 13-67h. It consists of the prefractionator which accepts the ternary feed stream followed by the main column that produces the products (product column). 

FIGURE 7.5 Flowchart of the light-water sulfoxidation process. Photoreactor (1), separators (2,5,8,9), SOj stripper (3), evaporating column (4), neutralization reactor (6), evaporator (7), exhaust gas (10), fresh paraffin (11), sulfonic acid (12), recycle paraffin (13), recycle gas (14), acid phase (15), air (Oj) (16), back paraffin (17). (After Falbe, J., ed., Surfactants in Consumer Products Theory, Technology and Application, Springer, Berlin, 1986. With permission.)... 

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